An Indian girl looks at a painting depicting the  Jallianwala Bagh massacre, also known as the Amritsar massacre, in the run-up to the 100th anniversary pf the atrocity on April 13th, 1919. Photograph: Narinder Nanu/AFP/Getty Images

After a long and tempestuous life in the service of British imperialism, Sir Michael O’Dwyer had got used to a quiet life. He endured years of recrim(...)